The Schonfeld's criteria calculator for fat embolism syndrome takes user input related to six clinical signs and symptoms, evaluating their presence as boolean (true/false) values. Each positive symptom is assigned a numerical score based on a predefined scale, and these scores are summed to determine if the diagnostic criteria are met.

The following scoring system is used:

| Symptom                                                | Score |
|--------------------------------------------------------|-------|
| Petechiae                                               | 5     |
| Diffuse alveolar infiltrates on chest X-ray             | 4     |
| Arterial partial pressure of oxygen < 70 mmHg           | 3     |
| Fever > 38 degrees C                                    | 1     |
| Heart rate > 120 bpm                                    | 1     |
| Respiration rate > 30 bpm                               | 1     |

For each symptom, if a user marks it as true, the corresponding score is added to the total score. The total score, ranging from 0 to 15, helps determine whether the diagnostic criteria for fat embolism syndrome are met.

The interpretation of the total score is as follows: If the total score is greater than or equal to 5, the interpretation is "Diagnostic criteria are met," indicating a likelihood of fat embolism syndrome. If the total score is less than 5, the interpretation is "Diagnostic criteria are not met," suggesting that fat embolism syndrome is unlikely based on these criteria.

Schonfeld's criteria for fat embolism syndrome is a diagnostic tool designed to identify patients at risk of developing this potentially life-threatening complication. The target patient population includes those who have experienced trauma or surgical procedures, particularly those involving long bones or the pelvis, where fat emboli may enter the bloodstream.

The primary components of Schonfeld's criteria include the presence of petechiae, diffuse alveolar infiltrates on chest X-ray, arterial partial pressure of oxygen less than 70 mmHg, fever greater than 38 degrees Celsius, heart rate exceeding 120 beats per minute, and respiration rate over 30 breaths per minute. Each of these components contributes to the overall score, which aids in the diagnosis of fat embolism syndrome.